warnock



H, WARNOCK.

"Am PUMP; I APPLICAT-ON FILED NDV. 17, 1916.

Patented NOV, 18, 1919.

"R. wAR'NocK.

AIR PUMP.

n y APPLICATION FILED NOV. 17| IQG. l

4 SHEETS-SHEET 4.-/

I IN1/mmf? ATTORNEY' Eil) ' vvay above the piston.

a nl..

cylinder will cause the valve 2() to move dovvnwardaway from its seat iii opposition to the force of the springs so as to permit the air or other 'flu-id to be drawn into the cylinder through the opening 15, chamber lll, yports 16 and 17, recess Q/l and ports 27. @n the up stroke oi the pistoiulthe valve 2O will close upon its seat under the influence of the springs 25 and of the pressure created in the cylinder. v

ln the forni of the invention illustrated, the discharge takes place through the piston into the crank case. ln.' the construction shown for this purpose, the piston 7 is formed with a recess in which fits a valve plate 31 which is provided with a series of ports preferably formed by recesses 82h1- tersected by a groove 33. The dischar e port formed by the groove is adapted to e interniittentlyA closed by. an annular valve 34- preferably or thin flat metal which is adapted te be held against its seat by a plu rality ci springs 35. A spider 36 is provided which has seats 37 for the springs and which is formed with a central boss S8 adapted to center and guide the annular valve 34: and to fit Within a recess 39 formed in the underside of the valve plate.- The spider 36 may be supported in position in any suitable manner as by means of aoscrevv l0 screwing into a boss Ll1 in the center of the valve plate. The valve plate is shown. as attached to the piston by means of a nuinbei or' screws 42. When .the piston moves up, the air or other luidwhicli has been drawn into the cylinder on the previous vdou/ii stroke is compressed and caused to lloiv through the ports 3Q-33, thereby opening the valve. 34- so to permit the air to escape through the hollow piston into the crank case. Upon the dovvn stroke of the piston, the valve 34 Will .close against its seat under the influence .of the springs and the dilierence in pressure due to the partial vacuum formed in the cylinder.

The pump of the forni shovvn is intended to be lubricated by oil contained in the lower part of the crank case and caused to be splashed over the Working; parts -by (the lower end of the connecting rod and crank as the latter rotates. Some of the oil splashes over the lovver 'part of the piston and cylinder Walls and so lubricates the piston and a part of this oil is likely to find its p Owing to the discharge taking place throughlthe piston and into 'the crank case, however, this oil is not 'Wasted but is returned to the crank case with the air discharged through the piston. As

the discharge takes place directly over the Wrist pin ybearings 45, it will also increase the eiiciency oi lubrication ci such bearings. as the volunie of the crank ,case is .relatively large, the air discharged the..

will lese rauch of its velocity The loss mullling ol' the sound oi' the exhaust, as the air which eventually is discharged through suitable openings in the crank case, suoli as 'the openings 46, will pass out more ou' less steadily and silently instead of in sharp pulls.'

Owing to the fact that the discharge takes place through the oilvi-esei'voir or crank case, an excess oic lubricant may be utilized as such excess instead of being rapidly dissipated as in pumps Where the exhaust takes place .in some other manneiglvvill be conserved and will circulate through the pump indefinitely. This insures the highest degree of lubrication and makes the puinp particularly adapted to give satisfactory serv ice in the hands of unskilled operators.

As illustrated, means are provided. for preventing the lossot oil from the main bearings and-providing for the return of any excess of oil passing through these bearings to the crank case. In the construction shown, the main bearings are lubricated from small reservoirs 50, into which some of the oil from the lovfei' part of the crank case is splashed. This oil works through the bearings toward the outer ends thereof and in order to catch this oil and throw (the same back into the crank case, I provide the portions of the shaft immediately outside of the bearings with grooves 51 having vertical walls forming abrupt shoulders 52 adjacent to the ends of the vlmarings and having inclined Walls 53 flaring outwardly. The oil when .it reaches these grooves Will be thrown from the shaft by centrifugal force and so-be caught in the recesses 54: of

the crank case instead of finding its Way outl through the openings 55 in the sides of the latter.

In Figs. 3 "and Il, I have illustrated a modi,- ied forni of my invention., in which I have shown a different form of inlet valve coristruction. ln this construction the cylinder 9 has vformed at its upper end an enlargenient in which is an annular chamber 61 having openings 62 fork connection with the inlet pipe 'ou pipes (not shown). The recessed valve seat 63 is formed in the topiof the enlargement 60,11 thin annular valve 'being mounted in this recess. A head 65 which maybe in .the forni of a atplate retains the valve in its. recess and limits its movement. An annular `port 66 connects the recess 68 with the chamber 61. A piston provided with a suitable exhaust valve coli-` struction or discliar "ng the air into the eranklcase .is utilize As illustrated the;

iisl

piston 7 isprcvided withfan `outlet valve shownn in landl i.

.ln riga t and l?, l have shown another 'ferm of my invention m which disk valves construction substantially the' same as that 'manana i are employed in place of the .annular valves shown in Figs. 1, 2, 3 and 4. As here illus trated, the cylinder 9 is provided with an inner head 70, in the upper surface of which is a recess 71 which communicates'with the interior of the cylinder through a plurality of`ports 7 2. In the center of the inner head is a small recess 73 which carries a'sprin'g4 74 adapted to lsupport a thin metal disk valve 75 in enga ement with a seat 76 foiined on the un erside of the valve'plate 7 T. The latter -has formed through it a plurality of ports 78 which are ada ted to e closed by the valve 7 5. The ports 8 communicate at their upper ends with the cham ber 14 of an outer head member or cover 11 of the forni shown in Fig. l. The discharge from the cylinder takes place through the piston which may be provided with a discharge valve construction of any suitable character. As illustrated the piston -is provided with a disk discharge valve similar to the inlet valve. This valve -which is designated by the numeral 80 is adapted to seat against a seat 81 formed onA the underside of the valve plate 82, which is provided with outlet port 83. The valve is retained Within a cage`84 formed on the underside of the plate 82 as shown in Fig. 7, being held within the cage by a screw-cap 85 screwing into the lower end of the cage and having a central recess 86, which carries a spring 87, bearing against the underside ot' the valve. The cage is provided with a series of ports 88 for the escape ofthe air.

The operation of this form of pump is substantially the same as that shown in Figs. l and 2.

ln Figs. 8 and 9, I have shown another modified form of my invention in which thin, spring metal, flap valvesare employed.

As here illustrated, -the cylinder 9 is provided with an inner head 90 formed Within let ports f )l which comn'iunicate with a recess 92 formed in the underside of a valve plate 93. The latter has a central port 94 which is normally closed by a flap valve 95 secured in the recess 92 by means of a pair of screws JG engaging notches 97 in the sides of the valv'c. v The latter owing to its flexibility and to the Jact that some play is left between it and the heads of the screws and the underside-oi the supporting plate is capable of moving toward and away from the seat so as to alternately close and open the air passage.

The discharge from' the pump takes place through the piston into the crank case in the manner and for the purposes heretofore described. As illustrated, the piston of the pump is provided with a fiap valve similar to the inlet valve, this Hap valve closing a port 98 in the head of the piston.

While I have. shown in the drawings and described in detail certain preferred embodithereof and I do not, therefore, desire to be limited vto the details of construction any further as specified in the appended claims, but, intend to cover my invention broadly in whatever form it maybe embodied.

Having thus described my invention, I claim: i

l. In apparatus of the character described, the combination of a cylinder, a head thereon including a lower member hav ing an inlet port therethrough and a second member on said lower member having an in- .letport therethrough and having an annm lar valve seat on its lower surface, said members being formed to inclose an inlet valve chamber between them, the ports in both of said members communicating with said chamber and an annular inlet valve in said inlet chamber adapted to close upwardly against said valve seat. 2.' In `apparatus of the character described, the combination of a cylinder,.a head thereon including a lower member, an intermediate member and acover member, said members being formed to provide recesses therebetween, an inlet opening into the recess between the cover member and the intermediate member, an inlet )ort connecting the interior of the cylin er with the recess between the interniediate member and the lower member, a port extending through said interuualiatc member and connecting the recess between the cover and the intermediatemember with the recess between the intermediate member and thel mounted thereon, a piston'therein having a discharge port therethrough discl'iarging into the crank case and arvalvc seat thereon, a thin, flat metal valve adapted to move upwardly against said seat to close the pas sage through said4 discharge port and adapted to move doujnwardlv away from said seat to open said port, a spring for urgi ing said valve upwardly against said seat and a spring carrying member connected to the piston for supporting said spring.

4. In apparatus of the character described, the combination of'a crank case constituting Van oil reservoir, a' cylinder mounted thereon, a piston therein having an opening through its head, a plate attached to the head of the piston and having a discharge port therethrough and having a .valve seat and a discharge valve adapted to Al" l 1,392,974

\ i close said scat and bo o n to perinit passage through said ldisc arge port said crank case. 5. In .apparatus of the character de- 5 scribed, thecombnation ofl -a' lcrank case constituting an oil reservoir, a cylinder" mounted thereon, avpiston therein having an opening through its head, a plate` attached to the piston head having;r a discharge port therethrough discharging into said ocrank. lo Vcase and having'a valve seat on its undcrside, a thin, .fiat metal valve adapted to close against said valve seat, a spring for urging said valve against its scat and a carrier for said spring carried by said late. 15

ROBERT VVAiUOA K. 

